Carbon quantum dots (CQDs or CDs) recently have attracted attention due to their unique optical and chemical properties. Herein we demonstrate a facile protocol to synthesize CDs via the microwave-assisted method. In this research, we use citric acid as carbon source and urea as nitrogen source. The UV-vis absorption of CDs show two peaks at 326 and 408 nm respectively correspond to the π→π∗ transition of C=C bonds and n→π∗ transition of C=O or other bonds on the CDs surface. The CDs solution emit green color emission at wavelength 521 nm λ excitation = 365 nm), which the highest PL intensity is achieved by the CDs heated in microwave for 15 min. Moreover, we also conducted a preliminary study of the CDs as sensitizers in dye-sensitized solar cells (DSSCs) based on TiO2 nanocrystalline. The power conversion efficiency (η), fill factor (FF) and short-circuit current density (Jsc) of 0.29%, 0.31 and 0.36 mA/cm2, respectively, are achieved for the CDs based cell. This research suggests that the CDs have the potential application as sensitizers in DSSCs.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 7 May 2019|
|Event||7th Asian Physics Symposium, APS 2017 - Bandung, Indonesia|
Duration: 29 Aug 2017 → 31 Aug 2017